Mary broders elliott executrix of



' UNITED STATES PATENT 0mm.

JAMES P. ELLIOTT, 0! OAK PARK, ILLINOIS; MARY BIDDERS ELLIOTTEXEGU'I'RIX OI SAID JAMES P. ELLIOTT, DECEASED.

PROCESS OF INSULATING AND BBINE AN D WATER PROOF MATERIAL,

Specification of Letters Patent. Pateflted Feb. 14, 1922,.

1,406,174. In Drawing. Application fled November 28, 1917. Serial No. 208,508.

To all whom it may concern:

Be it known that I, JAMES P. ELLIOTT, a citizen of the United States, residing at Oak Park, county of Cook, Stateof Illinois, have invented a certain new and useful Improvemer t-in Processes of Making Insulating and Brine and Water Proof Material, and declare the following to'be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same.

In my prior Patent lilo. 1,305,081, granted May 27, 1919, I have disclosed a new process of making a body or sheet of fibrous material saturated and coated with asphaltum. For some purposes it is desirable that the coating have characteristics different from those possessed by ordinary saturating compounds. Thus for example, where it'is desirable to give the sheet or body a high finish it is necessary to have a coating material which will be hard enough for this purpose and insoluble enough to resist the solvents that may be contained in varnishes, paints or enamels that may be applied thereto.

The object of my present invention is to produce a fibrous sheet or body of the kind referred to in my aforesaid patent but having, a hard coating capable of offering a high degree of resistance to the action of solvents and of taking a highfinish.

In carrying out my invention I intimately mix with wet pulp any desired percentage of finely divided hard asphaltum, usually a very large-proportion of dry asphaltum to dry pulp, and then press the pulp into shape. The pressure not onl gives the desired shape to the sheet or bod y but it also makes it dense and expels the water therefrom. After the product leaves the press I coat it with baking 0r stoving japan and bake it in an oven whose temperature is higher than the melting point of the asphaltum contained in the product. This operation melts the asphaltum and chan es it from a powdery state to a single co erent mass throughout japan assumes a state which will prevent it Y from flowin and closing the openings made by the escaping bubbles of air and moisture, and, when the japan dries and sets, it forms a continuous impervious coating.

The fiber in the mass ties the asphaltum together even at high temperatures. .Therefore, 'my improved product is stronger tougher and more durable than one made 0 asphaltum alone would be,.and at the same at time, it has a surface coatin which it would be impossible to place on a ody made of asphaltum' alone because such a body could not retain its sha e during the baking process but would me t and flow. It will also be seen that the fibers are all thoroughly coated by the asphaltum in addition to being enveloped .in the japan coating, and therefore my -1mproved roduct will be as thorou hly resistant to al agencies which aspha tum will resist as though the interior thereof were made of asphaltum alone.

While for many purposes asphaltum will be the most desirable material for mixture with the pulp, other materials such as rosin, natural and artificial waxes or gums, may be employed to advantage as substitutes for the asph'altum.

I claim:

1. The process which consists in intimately mixing wet pulp with finely-divided asphaltum, compressing the wet mixtureunder heavy pressure without apreliminary application of heat, then coating the mass with baking or stoving japan, and finally baking the mass at a temperature highenough to melt the asphaltum.

2. The process which consists .in intimately mixing with wet pulp finely-divided fusible material capable of resisting the action of acids and brines and having insulating properties, then pressing the wet mixture under heavy pressure, t on coating the mass with baking or stoving japan, and finally baking the mass at a temperature high enough to fuse said material.

3. The process which consists in intimately mixing with wet pulp finely-divided asphaltum, compressing the wet mixture'so as to compact the same and drive out a large 1 -part of the water without changing the char ester of the asphaltum, coating the compressed mass with baking or stoving japan, an' finally baking the mass at a temperature big enough to melt the asphaltum so as si- 11 multaneously to melt the aspheltum, drive out the moisture and bake the japan.

4. The process which consists in intimately mixin with wet pulp finely-divided fusible material capable of resisting the action of acids and brines and having insulating properties, compressing the Wet mixture so as to drive out a, large part of the Water without changing the character of said fusible material, eoatm the mess with baking or stoving japan, an baking the mass at a temperature high enough to fuse said fusible material.

In testimony whereof I sign this speeification.

JAMES P. ELLIOTT. 

